Students walk freely about the American University Campus near the Katzen Arts Center in Washington, Wednesday, shortly after a lockdown was lifted. The campus in the city’s northwest section went into a lockdown just before 8 p.m. following a report of a man with a gun.

American University on Wednesday lifted a lockdown triggered by an unconfirmed report of a gunman on its campus in Washington, D.C. and a suspect was in custody, a universityspokeswoman said.

The campus was on lockdown for about two hours while D.C. Metropolitan Police and the university's public safety department investigated the report, according to the university's website and D.C. police.